Abstract: The invention relates to a method and a device for determining the state of charge (SOC) of a rechargeable battery (106) of a specified battery type, or a parameter physically related thereto, in particular a remaining charge amount Q contained in the battery, wherein the method operates by means of a voltage-controlled battery model (102), which is parameterized for the battery (106) in question or a corresponding battery type. It is merely necessary to measure the battery voltage Umeas and to provide it to the battery model (102) as an input variable. The invention further relates to a method and a device for determining the state of health (SOH) of a battery (102), wherein the battery model (102), which is also used to determine the SOC, provides a modelled battery current Imod. Modelled charge amounts during charging and discharging phases of the battery (106) can be determined therefrom and compared with measured charge amounts, which are determined from the measured battery current Imeas.

Abstract: A method for charging and/or discharging an energy store with a current I0, wherein the energy store has at least one cell block having a number J of series-connected battery cells, at least some of the battery cells of which may have different efficiencies ?N, where 1?N?J, has the following method steps: determining the battery cell having the lowest efficiency ?min, and adjusting the efficiency ?N of all the other battery cells to this lowest efficiency ?min such that the adjusted efficiency ?N? of the battery cells is nN?=?min.

Abstract: The invention relates to a method for charging or discharging an energy store (2) with at least one cell block (20) consisting of multiple series-connected battery cells (3-7) by means of a series charging current (IO) flowing through all battery cells (3-7), wherein at least some of the battery cells (3-7) can have different capacitances (CN). In order to permit a reliable and quick charging of energy stores, the invention proposes measuring the capacitances (CN) of the N battery cells of the cell block at regular time intervals, and determining a maximum charging current for each battery cell based on the measured capacitances and a predefined C-factor (ratio of the maximum charging current IN;max to the capacitance CN) for each battery cell. With these maximum charging currents, the battery cells are then simultaneously charged during a charging time t (t?1/C) predefined by the C-factor.

Abstract: The invention relates to a method for charging or discharging an energy store (2) with at least one cell block (20) consisting of multiple series-connected battery cells (3-7) by means of a series charging current (IO) flowing through all battery cells (3-7), wherein at least some of the battery cells (3-7) can have different capacitances (CN). In order to permit a reliable and quick charging of energy stores, the invention proposes measuring the capacitances (CN) of the N battery cells of the cell block at regular time intervals, and determining a maximum charging current for each battery cell based on the measured capacitances and a predefined C-factor (ratio of the maximum charging current IN;max to the capacitance CN) for each battery cell. With these maximum charging currents, the battery cells are then simultaneously charged during a charging time t (t?1/C) predefined by the C-factor.